De Leon seems like a top candidate to start Saturday against the Cubs in place of Scott Kazmir (neck).
The stars seem aligned for De Leon's long-awaited major league debut, as Kazmir is on the DL and De Leon is coming off his most dominant performance yet with Triple-A Oklahoma City. De Leon took a no-hitter into the seventh inning Monday and finished with 10 strikeouts over seven scoreless innings, his second straight start with double-digit strikeouts and zero walks. He has posted a 2.86 ERA, .199 BAA and 98:20 K:BB in 78.2 innings with Oklahoma City this season. An official announcement regarding Saturday's starter may not come until later in the week.